Patent GB-338948-A (GB)
Title: Improvements in apparatus for extruding and coiling rods
IPC: B21C35/02
Filed: 1929-08-22
Abstract: 338,948. Triggs, W. W., (Scovill Manufacturing Co.). Aug. 22, 1929. Squirting ; reeling.-Rods are extruded in a substantially horizontal direction and coiled about a vertical axis in a machine having positive feed-mechanism between the extruding and the coiling means. The billet 125 is placed in an offset 155, Fig. 6, in a hydraulic slide 147 on the face of which the extrusion die 156 is mounted. The slide is then moved laterally against a stop to bring the billet into alignment with an hydraulically operated container 135. The billet is then pushed into the container by a perforated hydraulic pusher 170, which is then withdrawn. The slide is then returned against a removable latch 164, Fig. 12, normally pressed forward to engage a notch 165 by air pressure against the action of a spring 169 to place the die in alignment with the container, which is then pushed forward to fit over the die. The pusher 170 is then moved forward again to abut the die member and a hydraulic ram 115 is then moved to extrude the billet through the die and pusher. The die and pusher have twin-openings so as to extrude two rods simultaneously. These are guided along grooves separated by a Y-shaped rib in the frame 184, and are each fed by a series of pairs of rolls driven by change speed gear from an electric motor 251 so as to pass them through inclined holes in rotating whipping blocks 107 which loop them round hollow fixed posts 104 and lay them on platforms 106 in perforated coiling tanks. After extrusion is finished the ram is withdrawn and the pusher 170 is then withdrawn to allow the rod to be severed by an hydraulically-operated cutter 179 and on completion of the coils the platforms are either lowered by pneumatic pistons or by gravity into the water tank 103 to cool the coils, then raised by pneumatic pistons to discharge position and subsequently lowered back to initial position, or are directly raised to discharge position, then lowered to cool the platforms and finally raised to initial position. The finished coils are discharged by pneumatic-ejectors 312 on to a platform 311. After severing the rod the container is withdrawn to free the die and bring the stump against the ram so as to eject it. To provide for a billet or stump frozen in the container the latch 164 may be released and the slide moved to bring the offset 154 into alignment with the ram which is then driven forward to eject the billet &c. The rolls, which are connected by guiding throats, are continuously driven at a greater speed than the speed of emergence from the extrusion die so that the rods are under tension. The rolls are flanged, the lower rolls being positively driven and the upper rolls being mounted in spring pressed pivoted yokes in removable frames and driven by friction from the lower rolls when no rod is present and by friction through the rods during operation. The rolls 266 of each first pair are parallel to each other, the second and third pairs 266<A>, 266<B>, are mounted on inclined axes in a curve and the subsequent pairs of rolls 266<c> - - 266<G>, are mounted in horizontal axes on a curve in a plane at right amgles to the first. The first pairs of rolls are driven from the shaft 285, through gears on the shaft 253. This shaft is connected by gears 255, 256, 257 to a shaft 258, which, at each end has two pinions, one 259 for engaging gears 261 for driving the second and third pairs of rolls and the second 260 for engaging gears 267 on shafts connected by pinions to the shafts of the fourth and fifth pairs of rolls. The subsequent pairs of rolls are connected by intermediate gear, the last pair being connected by change speed gear and worm gear 274, 275 to the whipping block. The main pistons 303 of the elevating mechanism are secured to a crosshead 302 connected by draught rods 301 to the platforms and having pinions 307 engaging racks 308 on a frame 309 to steady the movement thereof. The auxiliary pistons 306<a> are not connected to the crosshead but abut against it to hold it in initial position and also to lift it from downward to initial position. The forward movements of the ram, container and die carrying slide are controlled by hydraulic inlet and exhaust valves 323, 327, 329 respectively, connected by pipe 322 to the supply pumps 321 and by pipes 320 to the exhaust. The valves are operated pneumatically from a supply pipe 326 through manually controlled valves at station 325. The ram withdrawing pistons 130, container piston 143 and slide piston 149 are returned by constant hydraulic pressure acting on a smaller area, and the stop 164 is manually controlled by a valve at station 325. The cutter 179 and billet pusher 170 are similarly withdrawn by constant hydraulic pressure but their hydraulic valves 344, 341 are controlled by solenoid-operated valves V<5>, V<6> and V<3>, V<4> at station 335, whereas the elevator pistons 303, 306<a> and ejector pistons 313 are operated pneumatically, the forward motion being under contact of solenoid valves V<8>, V<7> and V<9> and the return movement being under constant pressure. The valves V' - - V<9> are connected in a D.C. circuit containing contactors, the coils of which are automatically controlled in an A.C. circuit. The contactors are all normally in down position with their coils de-energized. The billet pusher solenoid valves V<3> and V' are arranged in the D.C. circuit but are controlled by hand switches 113, 114. In the preliminary withdrawals of the billet pusher, although the stop T' closes a switch S<4> in a circuit through the coil of contactor B, this coil is not energized as the contactor A is down. Prior to the final withdrawal of the billet pusher, e.g. when the parts are in position for extrusion, a hand switch 112 is closed to energize coil of contactor A which is thus raised. It is held up via another circuit when the switch 112 is released. Subsequent operations are effected automatically, the operation of one element being dependent on the operation of some other element. The withdrawal of the billet pusher closes switch S<4> to raise contactor B and so energize valve V<5> to move the cutter forward. The arm T<3> on the cutter closes switch S<3>, which raises contactor D and so deenergizes solenoid V<7> to place the auxiliary pistons 306<a> under return pressure. Contactor D is held up via another circuit when switch S<3> is released. Lifting of contactor D also causes contactor A to drop and consequently contactor B drops and valve V<6> is energized to return the cutter. For the second type of elevator cycle a switch 111 is closed and a doublethrow switch 110 is placed in its upper position. Consequently, when the crosshead 302 moves down a short distance a momentary switch S<5> is closed to complete a circuit through switches S<10>, S<11> and contactor E is raised to reverse valve V<8> and elevator is thus raised by the main pistons to discharge position. The contactor E is held up via another circuit when the switch S<5> opens. If the switches S<10>, S<11>, which are normally closed by withdrawal of the ejectors 312, are not properly closed, due to failure of the ejectors to withdraw fully, raising of the elevator is prevented. During normal operation, when contactor E is raised a break in wires 23, 43 causes contactor D to drop and valve V<7> is reversed to advance pistons 306<a>. The elevator, on reaching discharge position, closes switch S' and contactor G is thus raised so as to open the valve V<9> and thus push forward the ejectors. The ejectors close switches S<8> and S<9> to complete a circuit through switch 110 and coil of contactor H which is thus raised. This contactor is held up by a circuit through switch S<12> when switches S<8>, S<9> open. Raising of contactor H energizes coil of contactor F through switches S<8>, S<9>, 110, and wires 54<1>, 55, 56, 57, and contactor F is thus raised. This breaks circuit through coil of contactor G which drops and valve V<9> is reversed to withdraw ejectors. At the same time raising of contactor H deenergizes valve V<7> and pistons 306<a> move down. Raising of contactor F causes contactor E to drop and valve V<8> is de-enargized to allow pistons 303 to move down to carry the platforms into the cooling tank. Switch S<12> is thus opened and contactor H drops so as to energize valve V<7> and thus operate pistons 306<a> to raise platforms to initial position. In the first type of elevator cycle switch 111 is open and switch 110 in lower position. On closing switch S<3> the platform moves to the bottom of the tank. Switch S‹ is thus closed and contactor E raised to energize valve V<8> and thus raise pistons 303 to discharge position. Raising contactor E causes contactor D to drop, and valve V<7> is energized to raise pistons 306a. Switch S<7> is closed and ejectors remove the finished coil. Switches S<8>, S' are thus closed and contactor F lifted but not contactor H. Contactors G and E thereupon drop and valves V<9> and V<8> are de-energized to withdraw the ejectors and return the elevator to initial position. The hydraulic and air power units may be returned by variable pressure by modifying the valve gear and the solenoid valves may be open when the solenoids are de-energized and may be provided with push buttons for manual or mechanical operation. Specification 338,946; and 338,947, [Class 135, Valves &c.], are referred to in connection with the hydraulic valve units and electromagnetically operated valves.